Release note
Contents
1. C tri_shell_1 tri_shell_2 C tri_shell_joint C tri_shell_load C User_Spri E wave_col Q wave_jac E wave_maxway C zavas Figure 2 4 1 Example folders available for UNIX and NT PC 3 Input File Formats In the current version of the User s manual one chapter describing the UFO file format is added The UFO file format is used to describe the same type of information which normally is described in SESAM file format and has been used since 1994 by non SESAM users The type of information is Nodal ID s Coordinates and Boundary conditions Element ID s connectivity and properties etc USFOS recognises the file format automatically and the results are unaffected by the structural load file format used However mixing commands from the two input formats are not possible Special USFOS Control Parameters head fem 3 General Structure and Load input are specified in SESAM file format r UFO file format Figure 2 4 1 Input files to USFOS Release Notes USFOS version 7 6 SINTEF 1999 04 20 SINTER In the USFOS User s manuals following sections are found 6 3 USFOS Control Parameters 6 4 SESAM Structure and Load 6 5 UFO Structure and Load Following style guide is recommended see Figure 2 4 1 a Use the USFOS control file for the USFOS control parameters a Use the Structural file for the structure and load input described in either SESAM or UFO Sometimes it s2. Analysis Calibration to column buckling curves Automatic calculation of P Y T Z and Q Z according to API 1993 Automatic selection of the worst wave load phase to be applied in a pushover analysis used together with Wavadata Current Scaling du to units the wave forces found using the Max Wave option User control of the number of integration points to be used along the different beam elements when calculating wave loads Calculate and add buoyancy forces to specified loadcomb Specification of distributed element loads in local coordinate system Making non linear springs invisible in xfos f ex contact springs Check all elements for hydrodynamic forces User defined fracture Old identifier but extended options Loadcomb Loadlevel Time Utilization Strain Specification of elements to be waked up at a given loadcomb Old identifier but extended to Dynamic Analysis SINTEF 1999 04 20
3. be PS Be 145KE Application rA shod ere 2 431KB Application Figure 2 2 1 Program Code located in bin folder aa postos inca Ei oseni ustos cahe EN B ustos kehre B aos a zapas mera B zaya mero Figure 2 2 2 Files in ete folder NT to the left and UNIX to the right Installation on UNIX Create a root directory for USFOS the new USFOS_HOME directory Copy the actual bin and etc directories to USFOS_HOME Copy the Examples_UNIX and Document directories to USFOS_HOME Define the USFOS_HOME variable in the USFOS cshrc USFOS kshrc files Ooo vo SA b i al oe d OCUMEF t _ etc EJ examples Figure 2 2 3 Contents of USFOS_HOME folder after installation Release Notes USFOS version 7 6 SINTEF 1999 04 20 SINTER Installation on Windows NT 4 0 a Copy the new exe files located in the bin folder to the existing USFOS_HOME bin folder a Copy the new postfos inca file located in the etc folder to the existing USFOS_HOME etc folder a Copy the Examples_PC and Document folders to the existing USFOS_HOME NOTE If USFOS has never been installed on NT before please contact SINTEF For all systems a Copy the file USFOS key delivered on a separate diskette to the actual USFOS_HOME etc directory 2 3 Manual The User s manual is updated and paper copies of the actua
4. physical member is represented by shell elements effects like local buckling torsion buckling etc is predicted with high accuracy The necessary commands subshell and meshpipe used to define one shell beam element are described in figure Table 4 2 loverleaf Figure 4 2 1 Shell formulation on selected beam element Several simple examples are given on the CD ROM a ssh_cantilever QO ssh_col I a ssh_col_pipe a ssh_jac Release Notes USFOS version 7 6 SINTEF 1999 04 20 SINTER Use Shell Beam for elem 12 Elem_Id SUBSHELL 12 T Define mesh density n_Length n Cire Elem_Id MESHPIPE 6 12 12 Table 4 2 1 Input commands defining shell formulation on beam elements 4 3 Extreme Wave calculation Automatic member imperfections Modules for calculation of hydrodynamic forces are included in USFOS This means that using separate wave load pre processor is not needed Using the USFOS hydrodynamic in connection with static push over analysis will typically contain following Specify the actual wave type height period direction Specify the corresponding current if any Switch on buoyancy optional Specify criterion to be used for selecting worst wave position max base shear or max overturning moment Ooo vo an i ice z ES REE lt a pa z r See ie Direction of wave Direction of Wave p Figure 4 3 1 Automatic member imperfection according to wave force direction USFOS
5. spring is inserted in the middle of the layers defined under SOILCHAR a The soil strength is calculated according to API 1993 by specifying the geotechnical data in the command API_ SOIL Elem ID Soil ID Pile mat Pile_geo lcoor Imper PILE 1 O PILE PILE PILE PILE PILE PILE PILE T PILEGEO ID Type Do PILEGEO 2 2 122 0405 i ID Type 2 Mud D_ref Ffac API_Soil ID SOILCHAR 10 API 93 725 1 0 TAO 101 Clay 201 Clay 301 Clay 401 Sand S01 Sand 501 Sand 501 Sand 601 Sand o sD tad FA GO IRD SS d d CO Ga Gd OT N ID Type load Gam Plug Su eps50 APIJ Tresf QPLim API_SOIL 101 SoftClay Static 1 HOLS 2025 0 74 API_SOIL 201 StifClay Static 1 lt OT2 0225 0s 72 API_SOIL 301 StifClay Static 1 POOL 025 0 73 API_SOIL 401 StifClay Static 1 POO Q23 ID typ load Gam Plug Phi Delta rNq API_SOIL 501 Sand Static 8000 0 APT_SOIL 601 Sand Static 8000 0 Table 4 4 1 Input for automatic calculation of piles and soil capacities Release Notes USFOS version 7 6 SINTEF 1999 04 20 14 SINTER 4 5 Dynamic Analysis results Time Series A dynamic analysis may involve a large number of analysis steps 1000 100 000 and saving of analysis results is then a challenge It is then necessary to select a few results which could be saved every analysis step while the rest of the results could be saved more seldom In this way the user obtain following Q High density on the time series of the s
6. will then step through the actual wave and identify the worst wave position the position causing the highest base shear or overturning moment The hydrodynamic forces from this wave phase position are saved in memory to be used in the pushover analysis The calculated buoyancy forces are possible to separate from the other hydrodynamic forces and the user may specify how to use the buoyancy forces add to an existing deadweight loadcase etc Release Notes USFOS version 7 6 SINTEF 1999 04 20 10 SINTER Applying member imperfections one by one is a time consuming task but by using the new option CINIDFF the correct member imperfection is applied automatically for all beam elements The most common buckling curves are available defining the size of the imperfection see User s manual Ch 6 The direction of the imperfections follow the direction of the loads for a specified load case In Figure 4 3 1 the jacket to the right is exposed to waves with direction 45 while the jacket to the left is exposed to a wave with opposite direction 225 It is seen that the direction of the imperfections are opposite in the two cases size is scaled All necessary input is shown in Table 4 3 1 and it should be noted that these few commands replace 1000 s of input lines and use of separate wave load pre processor load files Comments to the input given in Table 4 1 1 see also example folder wave_maxwav Q Load case is used for
7. Qs m SINTEF Structural Engineering Address N 7034 Trondheim NORWAY Release Notes USFOS Version 7 6 FOR YOUR ATTENTION COMMENTS ARE INVITED FOR YOUR INFORMATION AS AGREED Tel 47 7359 5611 i i 477 2 aes pen Hoey Members of USFOS user group ONE COPY TO RECORDS OFFICE FILE CODE CLASSIFICATION Open PROJECT NO DATE PERSON RESPONSIBLE AUTHOR NUMBER OF PAGES 22L050 1999 04 20 Tore Holmas 18 Release notes USFOS 7 6 1999 Contents 1 Oy ache oaecacs ccna enw cacc cess eae conee cae rene seeccste won css E 2 2 CONTENTS OF CD ROM sscscsesesesesesesesscscscseseseseseseseseosssosesesesesesesesesesessososeseseseseseseseseseosssesesesesesesesesesese 2 2A ONER Vy oaa E N A EEA AAE A E E E AAEE 2 2 2 NEW VERSIONS OF THE PROGRAM CODEG sccsccscscescscscscescsceccscuccscscescscescscscscesescesesceceecssescssescscscscesences 3 Za VPI boc poe ees sp sec decelerate aceburedetessSeacaccasedecsoanedea sce ced ouceiossesceget daaquybeaacasvedsees Seasaccaseccnteausterecobesseseaasts 4 ak TAM eee een eee eee eee eT eee eee eee er eee 4 3 INPUT FILE FORMATS sssscesscscccssssca se connsceescas tcnoesacaesscoanaaresacseceaceasacaarncvcascasencaneoeaniaeescasenaeeosseceeebesiewesaoseee 5 4 NEW PETUR Senin rn EE RE eee ER ee SR ATCO 6 Mies OS Meg A AN UE NY Teepe erect sce E rn E EE are sto edhe ss ae masse sere ecicile Se setae E E AE same cmeates 6 4 2 SHELL FORMULATION FOR BEAMG ccccoscoscecceccscesccceccecescescescecesce
8. Table 4 6 1 a The impacting object just a pipe consists of 3 nodes and 3 beam elements a One beam element the contact spring refers to MREF material and is then automatically transferred to a 2 node non linear spring a The MREF material refers further to P_d curves one per degree of freedom In this example only axial stiffness is included and the other references are set equal to zero means no stiffness in theses degree of freedoms Release Notes USFOS version 7 6 SINTEF 1999 04 20 SINTER 17 a The Axial stiffness is defined as a hyper elastic material with a curve as shown in the figure above The spring bust be compressed 0 650 m before any force is activated and the stiffness increases after a deformation of 0 100 m The hyper elastic material has no elastic unloading the forces follow the input curve during loading as well as unloading Q The non linear spring with element ID 1000 is given an Axial damping characteristics of 20 000 N m s using the SPRIDAMP command The damper forces will be activated once the relative speed between the two element ends are different from Zero and the direction of the force is always opposite to the velocity like hydrodynamic drag damping a The impacting body is given an initial velocity of 2 m s in positive X direction using the INI_VELO command and material specification All elements with the specified material ID here no 10 will be given the specified initial velocit
9. al Wint DYNRES_General Wplast DYNRES General Wkin DYNRES_ General Wtot Table 4 5 1 Input for Dynamic result saving See also in the example folders dyn_drop dyn_imp dyn_imp2 dyn_quak Ooo vo Release Notes USFOS version 7 6 SINTEF 1999 04 20 15 16 SINTER 4 6 Impact Analysis including dash pot dampers As an alternative to the standard impact options BIMPACT DYNIMPCT it is sometimes necessary to model both the structure and the impacting object The impacting object is defined as a separate structure and is assigned the appropriate properties mass initial velocity etc In order to determine the contact between the two structures a non linear spring is used In Figure 4 6 1 this spring is seen between the impacting structure the pipe and the slender frame The spring properties P_d curve is shown in the figure and the curve is specified in the example file described in Table 4 6 1 See also example folder damp_2 Compression Figure 4 6 1 Slender frame impacted by a separate structure with contact spring The presence of physical dampers like the ones in your car will reduce the damage on the structure and boat fenders is often equipped with dampers mounted in parallel with springs USFOS 7 6 is extended to cover this type of suspension details and the dash pot damper characteristics C for a given non linear spring is specified in the input file Comments to the input in
10. convenient to spread the structure load input in two files Structure file and Load file 4 New Features 4 1 Shell Element From version 7 6 a non linear triangular shell element is available The element is specified through general SESAM input format element type 25 or using the TRISHELL command UFO input The thickness is specified similar to the existing membrane element The non linear material parameters are given in the usual MISOIEP record Both concentrated load conservative distributed load and pressure load are available In Table 4 1 1 the necessary input records are given for both file formats Figure 4 1 1 Non linear shell element in USFOS Example tri_shell_joint Release Notes USFOS version 7 6 SINTEF 1999 04 20 SINTER Item SESAM file format UFO file format Element definition GELMNT1 GELREF1 TRISHELL Plate thickness GELTH PLTHICK Material properties MISOIEP MISOIEP Concentrated nodal Load BNLOAD NODELOAD Pressure load non conservative BEUSLO PRESSURE Distributed conservative load SHELLOAD Table 4 1 1 Input records for triangular shell element For more detailed description see User s manual Ch 6 See also following example folders tri_shell_1 tri_shell_ 2 tri_shell_joint tri_shell_load ODoo vo Result presentation The results for the shell element is presented in XFOS and available element results are plastic strain and plastic utilisation These result types a
11. dead weight and calculated buoyancy a Load case 2 is used for the extreme wave Load case 1 is not scaled beyond factor 1 0 that s why the calculated buoyancy forces is separated from the other hydro forces and added to this load case Load case 2 forces are scaled to platform collapse Q The direction of the member imperfections CINIDEF par no 2 and 3 follows the direction of the member forces defined by load case 2 which is the calculated wave forces a The size of the imperfection CINIDEF par no 1 is calculated according to Chen column curve a A Stoke 5 th wave with height 25m period 16s 45 direction is applied The sea surface is located for global Z coordinate 0 0 Water depth is 100m a A current profile with peak value 2 m s is defined with same direction as the wave From depth 20m Z 20m relative to the sea surface the current is reduces linearly a The actual wave is stepped through the structure with time increment 1 s The wave position giving the highest base shear in the interval Time 0 20s is used in the push over analysis NOTE As all hydrodynamic calculations are using SI units the forces are calculated in N Newton If f ex MN is used as force unit the wave forces must be scaled before they are used in the pushover analysis The command WAVMXSCL lt factor gt is used see also User s manual Ch 6 In the current example the wave forces are scaled with a factor 1 3 just for demo pu
12. elected most important results a Acceptable density on the results presented in XFOS for inspection of the global behaviour of the structure f ex generation of animation etc The few selected result quantities are stored in a separate file with extension dyn in addition to the usual raf file The dynamic results are accessed from XFOS through the result dynamic_result dialogue box see Figure 4 5 1 Dynamic Results _ i Es Vertical axis customization Intemal Energy Scientific notation C Decimal floating point 3 Number of decimals Sis 60 0 Export p Ok Print Save File prefix t_Riserifinanimp_Mass_4000_v 2 105 60000 00 4 000e 006 Format f 2 000e 006 0 000e 000 0 p 4 j j 100 0 Cancel Time seconds Plot Ok Print Save Cancel Figure 4 5 1 Selecting Dynamic Results from XFOS Following results are a NODAL Displacement Velocity Acceleration Relative displacement between two nodes a ELEMENT Displacement Force Release Notes USFOS version 7 6 SINTEF 1999 04 20 SINTER a GENERAL Internal Energy Plastic Energy Kinetic Energy Total Energy See Table 4 5 1 for example of use Type Node_ID DYNRES_Node Dis 10 DYNRES_Node Dis 130 DYNRES_Node Vel 130 DYNRES_Node ACC 130 T Type Node_ID Dof Node_ID Dof DYNRES_ Node RelDis 10 130 T Type Elem_ ID DYNRES_Elem Disp 20 DYNRES_Elem Force 20 Type DYNRES_Gener
13. l pages are delivered In addition the most important part of the manual the Input Description is available for on line reading using f ex Adobe Acrobat Reader or any other PDF readers Contents of Document A free PDF reader is available on www adobe com 2 4 Examples Approx 40 examples are given under the Examples directories The contents of the UNIX and PC examples are identical the only reason for having two folders is due to computer compatibility UNIX and PC represent the files differently The input files are located in separate folders one example per folder see Figure 2 4 1 In each folder following files are found Head fem USFOS control parameters Stru fem Structure and load description in either SESAM or UFO file format In some cases both SESAM and UFO formats are given for the same example and then the stru file has a postfix u for UFO and s for SESAM Any of the two variants stru_u fem or stru_s fem should produce the same results The USFOS control parameters are unaffected by the file format used to describe the structure and loads See also Chapter 3 Release Notes USFOS version 7 6 SINTEF 1999 04 20 SINTER Contents of Examples_PC C API_spri DAPI spri_crack E beam E column E dyn_imp2 E dyn_quak ee etc E joint E Joint_API_spri E Joint_API_spri_crack fa Joint_User_Spri E ssh_cantilever E ssh_col_i E ssh_col_pipe C ssh_jac
14. re new and are accessed through the new button ELEMENT In Figure 4 1 2 the dialogue box used for shell element selection is shown File Edit Verify Customize Help Load cases Deformed model Colour frii off Plastic interaction value Accumulated plastic work Shell Element Displacement Velocity results Element force Genera Element Piukat Ue ee strain 4S Pea ee T AZSZWZ Hess ceo Se Ss ZT PN PR SAS Rm Temperature field PIAS nae rere Figure 4 1 2 Selecting Shell Element Result Release Notes USFOS version 7 6 SINTEF 1999 04 20 SINTER By default no element mesh is shown on the model image but using the Verify Show Mesh option as shown in Figure 4 1 3 the user may switch on the mesh The same button is used to switch off the mesh visualization cubase Results Custo Element gt A Switch on mesh visualization v Show mesh Colour fringe off Thickness Yield stress gt E module gt Figure 4 1 3 Switching ON OFF mesh visualization 4 2 Shell formulation for beams In addition to having the triangular shell element available directly one by one as an ordinary element the shell element is possible to access through the shell sub structure option An ordinary beam element pipe box etc is then represented by shell elements in stead of the normal beam formulation see Figure 4 2 1 As the
15. rpose Q For both the buoyancy forces and the wave forces it is possible to print the calculated forces to separate files but in the example printing is switched off nowrite Release Notes USFOS version 7 6 SINTEF 1999 04 20 11 Lcomb 1 is gravity loads and static deck loads calculated buoyancy Lcomb 2 is Stoke Wave 45 deg diretion nloads npostp mxpstp mxpdis CUSFOS 10 15 1 00 0 05 lcomb lfact mxld nstep minstp 1 TO TsO 10 0405 Dead Buoyancy 2 ORES 3 0 50 0 001 Wave 6 0 100 Apply automatic out of straightness Use loads from Waves lcase 2 i Size Pat LoadCase Separate Bouyancy from wave forces Add Buoyancy to load case 1 BUOYANCY Define Wave lt type gt H Period Direction Phase Surf_Lev Depth WAVEDATA Stoke 25 0 16 0 45 0 0 100 Speed Direction Surf_Lev Depth CURRENT 2 45 0 0 100 Identify Worst Phase Max Base Shear and do not create a loadfile Criterion EndT Write MaxWave Baseshear 1 20 0 noWrite Scale the Wave load This option is required when Force Unit is not N generated wave loads are always using Newton In this demo case scale by 1 3 Table 4 3 1 Input for automatic wave calculations and automatic member imperfections Release Notes USFOS version 7 6 SINTEF 1999 04 20 12 SINTER 4 4 Pile Soil Automatic generation of piles and soil capacity The automatic generation of piles and corresponding soil capacities is a powerful option which requires a few inpu
16. scescsscssescescescsscesescescescssescescescssescescescesens 8 4 3 EXTREME WAVE CALCULATION AUTOMATIC MEMBER IMPERFECTIONS cscececececcececececcccccececsescecececacess 9 4 4 PILE SOIL AUTOMATIC GENERATION OF PILES AND SOIL CAPACITY cccccsceccecescsceccececcececescucescecescncess 12 4 5 DYNAMIC ANALYSIS RESULTS TIME SERIES ccscssacsvsadsascsssccaunwaswssdcaconsendvacsdawceectebiavacenaeddsustaudiecosmessbansacdewnxe 14 4 6 IMPACT ANALYSIS INCLUDING DASH POT DAMPERS sscecceccscescecceccecescescccectscescscecescescscescssescesceseecs 16 5 NEW MODIFIED INPUT IDENTIFIERS ceccccccsccccccccccccccccccccccccccccccccccccccccccccesccccccoccecs 18 This memo contains project information and preliminary results as a basis for final report s SINTEF accepts no responsibility of this memo and no part of it may be copied SINTER 1 Introduction The current version of USFOS version 7 6 99 04 20 is the final release of the 97 98 user group development period The 7 6 version is the USFOS version which will be used when the next millennium 1s entered As USFOS does not use date as input to the calculations print of time for analysis initiation only the change from year 1999 to 2000 is assumed to cause no problems By artificially changing the date to the year 2000 one customer has tested the USFOS package on their own computers with following conclusion We have successfully te
17. sted USFOS XFOS and POSTFOS thru 2 3 crucial date changes and has worked in all cases The current release with date 1999 04 20 contains following a CD ROM a Updates of User s Manual a Release Notes this MEMO 2 Contents of CD ROM 2 1 Overview The CD contains documentation examples and new versions of the program codes and the organisation is described in Figure 2 1 1 Both UNIX and NT solutions are collected in the same CD Contents of ushos 6 Tie fi Document File Folder 15 06 99 13 41 9 Examples PL File Folder 15 06 99 13 41 JJ Examples UNIS File Folder 15 06 99 13 45 ES Ustos for DecAlpha File Folder 15 06 99 13 44 EQ Ustos_for_ HP File Folder 15 06 99 13 43 J Usfos_for_SGl File Folder 15 06 99 13 44 9 Ustos_for Windows NT 4 0 File Folder 15 06 99 13 44 Figure 2 1 1 Contents of CD ROM Release Notes USFOS version 7 6 SINTEF 1999 04 20 SINTER 2 2 New versions of the program codes Under each file folder f ex USFOS_for_Windows_NT4 0 two folders bin and etc are located The bin folder contains the program code while the etc folder contains set up files Contents of Ustos_for Windows MT 4 0 Contents of bin ii Bi m a2 Ps ee Application a gnuplot exe 4559K6 Application a gnuplot 11 exe AEB Application a mbios exe 100KE Application a posthos exe 1 036K Application a Shuman ere 1 266KB Application r uzfor ewe 2 21KB Application mi
18. t lines only The user s structure ends at mud line and all elements below mud line are generated automatically by USFOS see Figure 4 4 1 In Table 4 4 1 overleaf the necessary commands used to produce the foundation model shown in the figure are given See also the example in folder PSL 2 User s Strucutrual Model Generated by USFOS Figure 4 4 1 Automatic generation of piles and soil capacity Comments to the input in Table 4 4 1 a The foundation consists of 4 pile clusters each with 7 piles and 4 single piles a This foundation is defined as 8 PILE elements which refer to one of the two PILEGEO records Q PILEGEO number 1 consists of 7 pipes with diameter 1 22m The individual positions are specified through local Y and Z co ordinates referring to the PILE local axis Q The PILE local x axis goes downwards from the pile head towards the pile tip Q PILEGEO number 2 is a single pile here defined as a group with only one pipe in the centre of the pile element axis The single pile option could also been used see UM Ch 6 Release Notes USFOS version 7 6 SINTEF 1999 04 20 13 SINTER Q For all the 8 piles the same soil exists refer all to the same SOILCHAR record a The SOILCHAR is specified with 3 clay layers and 3 sand layers However in order to obtain a reasonable element density in the rather thick sand layer no 2 24 1 to 48 8m the same soil property no 501 is referred to three times The soil
19. y 1000 1001 ID HypElast 1001 Dof SpriDamp Axial lt 2 000 000 2 000 Lore OU 22 860 22 860 8 ae aes ee oe a np2 material geom lcoor eccl ecc2 1002 10 10 1003 10 10 45 1000 0 Spring with damper 0 020 O 0 750 650 100 100 000 N m s 2 0E4 Elem_1 1000 Elem 2 Initial Velocity applied to material 10 Vz Vrx Vry Vrz Mat_ID 0 0 0 0 10 Table 4 6 1 Input for defining an Impact Object with nonlinear damper spring See User s Manual Ch 6 for further details See also in the example folders a Damp_l Q Damp_2 Release Notes USFOS version 7 6 SINTEF 1999 04 20 SINTER 18 5 New modified input identifiers Since last main release 7 4 following input identifiers are added extended TRISHELL SHELLOAD SUBSHELL INI_VELO DampRatio DynRes_N DynRes_E DynRes_G CINIDEF API_SOIL MAXWAVE WAVMXSCL WAVE_INT BUOYANCY COROLOAD INVISIBLE WET ELEM USERFRAC ACTIVEIM Release Notes USFOS version 7 6 Specification of triangular non linear shell element Specification of distributed conservative load for shell element Switch ON shell formulation for specified beam element Initial velocity of specified node s or bodies materials Structural damping given in terms of damping ratios and associated frequencies Time dependent optional Dynamic Result Nodal data Dynamic Result Element data Dynamic Result Global data
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